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CVE-2026-18453 (GCVE-0-2026-18453)

Vulnerability from cvelistv5 – Published: 2026-09-07 14:14 – Updated: 2026-09-08 07:56
VLAI
Title
389-ds-base: 389-ds-base: pre-authentication null pointer dereference via paged results and use_one_backend control in op_shared_search
Summary
A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:64771 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64776 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64778 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64779 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64780 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64781 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64783 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64784 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64785 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64789 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64790 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64791 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64792 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64793 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64804 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-18453 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2509696 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version CPE status
Red Hat Red Hat Directory Server 11.7 E4S for RHEL 8 Unaffected: 8080020260903102346.f969626e , < * (rpm)
    cpe:/a:redhat:directory_server_e4s:11.7::el8
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Red Hat Red Hat Directory Server 11.9 for RHEL 8 Unaffected: 8100020260904171440.37ed7c03 , < * (rpm)
    cpe:/a:redhat:directory_server:11.9::el8
Create a notification for this product.
Red Hat Red Hat Directory Server 12.2 E4S for RHEL 9 Unaffected: 9020020260903155914.1674d574 , < * (rpm)
    cpe:/a:redhat:directory_server_e4s:12.2::el9
Create a notification for this product.
Red Hat Red Hat Directory Server 12.4 E4S for RHEL 9 Unaffected: 9040020260903102623.1674d574 , < * (rpm)
    cpe:/a:redhat:directory_server_e4s:12.4::el9
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:3.2.0-10.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:3.0.6-21.el10_0 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support Unaffected: 0:1.3.11.1-15.el7_9 , < * (rpm)
    cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020260904155442.25e700aa , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
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Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 8040020260901171549.96015a92 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.4::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 8040020260901171549.96015a92 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.4::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 8060020260901145727.824efc52 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 8060020260901145727.824efc52 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 8080020260831180218.6dbb3803 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 8080020260831180218.6dbb3803 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.8.0-10.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/a:redhat:enterprise_linux:9::crb
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:2.2.4-22.el9_2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:2.4.5-29.el9_4 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:2.6.1-24.el9_6 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6::appstream
    cpe:/a:redhat:rhel_eus:9.6::crb
Create a notification for this product.
Red Hat Red Hat Directory Server 12     cpe:/a:redhat:directory_server:12
Create a notification for this product.
Red Hat Red Hat Directory Server 13     cpe:/a:redhat:directory_server:13
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Date Public
2026-09-07 09:00
Credits
Red Hat would like to thank Arthur Chan (Ada Logics) and Team (Anthropic) for reporting this issue.
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    "dateReserved": "2026-07-31T06:49:45.234Z",
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-08T07:56:53+00:00",
      "cve": "CVE-2026-18453",
      "id": "CVE-2026-18453",
      "initial_release_date": "2026-09-07T09:00:00+00:00",
      "product_status:fixed": "472",
      "product_status:known_affected": "5",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and USE_ONE_BACKEND control in op_shared_search",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18453.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.